Ammeter



June 3, 1930.

R. o. HELGEBY AMMETER Filed May 28. 1928 Patented June 3, 1930 UNITEDSTATES PAT NT OFFICE RALPH HELGEBY, OF FLINT, 'mcmean, assrenon TO A oSPARK rLUe contrar OFFLIN'I', MICHIGAN, "A COMPANY OF. MICHIGAN AMMETERApplication filed Kay 28, 1928 Serial 110. 281,098.

This invention relates to ammeters, and has particular reference toimprovements relating to supporting means for the'various parts of theammeter.

The invention has for its object to construct an ammeter which will havea combined conductor and supporting'means.'

The object pf, the invention isaccom-' plished by providing a U-shapedconductor or supporting frame having a pairoi laterally projectingwingsat the legs of the U. The frame or conductor is secured to .the ammetercasing by means of bolts passing through the wings.

The U-shaped portion of the supporting frame is provided at the base ofthe U with a slot for. the reception of a unit on which is mounted thepointer swinging mechanism. At substantially the ends of the legs of theU a second slot is provided, in which a permanent magnet is mounted.

The outer portion of the base of the U is provided with studs orprojections the purpose of which is to fasten the dial to thesupporting'member.

On the -drawing,'Fig.ure 1, is a front view of the ammeter' of theinvention with the dial broken away.

/ Figure 2, is a section on theline 2'-2".of Figure 1. I I Y Figure 3,is a rear view with parts broken away to better illustratethe'invention. Figure 4 is asection on the line 44 of Figure 1. g

indicates the casing of theammeter. At the outer rear portion -of thecasing there is applied an insulating strip 12, while a secondinsulating strip is applied at the inside over the bottom 16, of thecasing 10. Seated on the insulating strip 14, are the wings 18, and 20,of a supporting frame or conductor indicated as a whole at 22. Bolts-24and 26, pass through openings in the wings 18 and 20, the insulatingstrips 12 and 14, and the bottom 16 of thecasing and are held inposition. by means of the lock nuts 28 and 30. I The conductor orsupporting frame 22, is shown as of generally U-shape, the U-shapedportion comprising the base-:32 and the legs Referring to the drawing,the numeral 10,"

34 and 36. At the inner portion of the base 32 there are provided thegrooves or slots -38 extending at both sides of the legs 34 and 36 andin which slots there is supported the on which there is mounted thearmature 50 a and the pointer .52.

Positioned substantially at the endsof the legs 34 and 36 of the Uportion 22, is a second pair of co-operating grooves or slots 54 inwhich there is inserted the permanent magnet 56.

The plate portion 40 as well as the magnet 56 may be rigidly secured intheir respective slots 38 and 54 either b a press fit, or by pinchingthe metal toget er at the groovesbaslg The 'ng is provided with theusual transparent or glass front 58, and the bezel ring 60 is securedover a flange 62 on the member 22 is provided'with the integral lugs orprojections 64 and 66 which serve as a means for holding the dialrigidly on to the base of the supporting frame 22. The

dial is secured by riveting over the ends of the lugs 64 and'66.

By the structure of the invention as described it will be apparent thatthere has been provided a compact and secure arrangement for holding thevenous parts of the ammeter in secure relations and that the conductoralso serves as a supporting member. I

I claim:

1. In an ammeter, a conductor having a plurality of slots, a pointerswinging mechanism mounted-in one slot and actuated in response to theenergization of said conductor, and a permanent magnet mounted inanother slot and adapted tobias said mechanism' to its zero position.

2. In an ammeter, a U-shaped conductor net mounted at the end of legs ofthe U, a

pointer swinging unit mounted on the U,

and a, dial mounted at the base of the U by means of lugs inte gral withthe'frame.

' 4:. In an'ammeter, a U-shaped sup orting frame, flanged wings'on thelegs 0 the U by means of which the frameis secured to the casing, apointer swinging mechanism mounted .on the inner side of the base of theU, a dial mounted by means of integral lugs on the outer side of thebase of the U, and a permanent biasing magnet mounted at the end of thelegs of the U.

5. In an ammeter, a U-shaped conductor having a slot at the base of theU and a slot at the extremity of each leg of the U,

a pointer swinging mechanism supported in' one of saidslots, a permanentma net supported in the other slot, a dial, an integral In on saidconductor by sa1d dial is secured to sa1d conductor.

' 6. In an'ammeter, a U-shaped supportingframe for mounting the ammeterparts, a pointer swinging mechanism mounted as a unit at the ase of theU, and a .magnet mounted on said frame at the ends of the legs of the U.I g

7; In an electric measuring instrument, a

U-shaped supporting 'frame, and pointer swinging mechanism separatelyconstructed I and mounted at the base of and inclosed mechanismconstructed as a uniti said mech;

- ends of the le s of the U. 65

within the U, and a magnet mounted at the ends of the legs of the U.

8. In an electric measuring-instrument, a'

frame having a plurality of grooves, a

pointer swinging mechanism constructed as a unit, sa1d mechamsm meludmsaid plate adapted to be received in some of sa1d grooves to rigidlymount the mecha- -nism,and a magnet mounted in' other of said rooves.

'9. ii an electric measuring instrument, a

U-shaped frame having a plurality of grooves inside the U, a pointerswinging anism including a plate mounte in some of said grooves torigidly hold the mechanism,

means of which a pointer swinging mechanism mounted in one pair of saidgrooves, and a magnet mounted inanother pair of said grooves,

said magnet spaced from said insulation.

In testimony whereof I afix my signature.

- RALPH O. HELGEBY.

a plate,

and a permanent magnet mounted in' other of said grooves. 10. In anelectric measuring instrument a U- haped frame having a plurality oi--grooves a pointer swin i mechanism'cond hidi ng a plate, said plateadapted to be-received in grooves at the baseof theU, and a permanentmagnet structe as a unit inc mounted in grooves at the inner side of theinstrument, I

